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List of Abstracts 201P-Observations 2.69 ID:4145 10:30Long-term observation of aerosols in Beijing, China, from 2001 to 2009: The impact of the OlympicGames 2008 on the air quality of Beijing cityTomoaki Okuda 1 , Shinichiro Matsuura 1 , Daisuke Yamaguchi 1 , Shigeru Tanaka 1 , Kebin He 2 , YongliangMa 2 , Yingtao Jia 2 , Qing Zhao 2 , Yuan Cheng 2 , Linlin Liang 21 Keio University2 Tsinghua UniversityContact: okuda@applc.keio.ac.jpThis research has been achieved in order to quantify the long-term trend of the air quality in Beijing, Chinawhere the outstanding and historic development has undergone in the past 10 years at the beginning of the21st century. We have measured the concentrations of PM10, PM2.5, and chemical species in aerosols suchas ionic species and polycyclic aromatic hydrocarbons at Tsinghua University, Beijing. PM10 concentrationin Beijing from 2001 to 2009 was 147.0±89.6 µg/m3 (n=3113). It was approximately five times higher thanthose observed in several other cities in the world. PM2.5 concentration in Beijing from 2005 to 2009 was77.4±65.9 µg/m3 (n=1164). The air quality in Beijing has not been improved during the past 10 years interms of the aerosol pollution. Many regulations that have been applied to prevent the air quality in Beijingfrom the air pollution during the Olympic Games 2008 made the larger aerosols that have the particle sizelarger than 2.5µm reduced 25%, however it didn’t work well for the reduction of much smaller aerosols thathave the particle size smaller than 2.5µm. Calcium and sulfate have significantly decreased during theOlympic period.P-Observations 2.70 ID:4298 10:30Layered structures of the physical,chemical and optical properties of the particulate matter in theboundary layer over Beijing, ChinaBin Chen 1 , Guangyu Shi 1 , Yasunobu Iwasaka 21 Institute of Atmospheric Physics, Chinese Academy of Sciences2 Kanazawa University, JapanContact: chen_bin@mail.iap.ac.cnProfiles of particulate matter were measured several times over Beijing extending from the surface to 1000mor so, by using a tethered balloon observing system. The tethered-balloon-borne instruments included anoptical particle counter to measure number concentration of particles in several channels and a 2-stage lowvolumeaerosol impactor (LAI) to directly collect particles for electron microscopic analysis afterwards, andtogether with meteorological radio sonde for getting temperature and relative humidity profiles. Meanwhilethe corresponding lidar signals were used to make comparison with the balloon-borne observations. Theresults are reported separately for clear and hazy days by categorizing the days as clear or hazy on the basisof visibility data. Obvious inversions at the altitude about 500-600m high appeared under hazy weather,below which particulate matter seemed to be confined, meanwhile clear weather was identified by relativelyuniform vertical structure of aerosol profiles in the low atmosphere. Lidar signals evidenced the fact well, inthat the aerosol layer of relatively large extinction value extended to higher altitude than hazy days. Differentparticle type’s profiles could also be seen between the cases in hazy and clear weather. Relatively largedepolarization ratios in the area in some cases were not only caused by mineral dust but also sea-saltparticles, especially in dry condition, probably the crystallized sea-salt particles.iCACGP-IGAC 2010 14 July, 2010